We study the evolution of cosmological perturbations, using a hybrid approximation scheme which upgrades the weak-field limit of Einstein's field equations to account for post-Newtonian scalar and vector metric perturbations and for leading-order source terms of gravitational waves, while including also the first- and second-order perturbative approximations. Our equations, which are derived in the Poisson gauge, provide a unified description of matter inhomogeneities in a Universe filled with a pressureless and irrotational fluid and a cosmological constant, ranging from the linear to the highly nonlinear regime. The derived expressions for scalar, vector and tensor modes may have a wide range of cosmological applications, including secondary CMB anisotropy and polarization effects, cosmographic relations in a inhomogeneous Universe, gravitational lensing and the stochastic gravitational-wave backgrounds generated by nonlinear cosmic structures.
Unified treatment of cosmological perturbations from superhorizon to small scales / C. Carbone, S. Matarrese. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 71:4(2005 Feb), pp. 043508.043508-1-043508.043508-11.
|Titolo:||Unified treatment of cosmological perturbations from superhorizon to small scales|
CARBONE, CARMELITA (Primo)
|Parole Chiave:||nuclear and high energy physics; physics and astronomy (miscellaneous)|
|Settore Scientifico Disciplinare:||Settore FIS/05 - Astronomia e Astrofisica|
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
|Data di pubblicazione:||feb-2005|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevD.71.043508|
|Appare nelle tipologie:||01 - Articolo su periodico|